Saw-tooth-ribbing machine



(No Model.) 3 Sheets-Sheet 1'.

, G. H. DOUGLAS. SAW TOOTH RIBBING MACHINE. No. 601,999. Patented Apr. 5,1898.

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(No Model.) 3 Sheets-Sheet 2.

O. H. DOUGLAS. SAW TOOTH RIBBING MACHINE.

No. 601,999. Patented Apr. 5,1898.

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G. H. DOUGLAS. SAW, TOOTH RIBBING MACHINE.

Patented Apr. 5, 1898.

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CHARLES H. DOUGLAS, OF CHICAGO, ILLINOIS.

SAW-TOOTH-RIBBING MACHINE.

SPECIFICATION forming part of Letters Patent No. 601,999, dated April 5, 1898. Application filed May 26, 1897. Serial No. 688,317. (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES H. DOUGLAS,-

a citizen of the United States, and a resident of Chicago, in the county of Cook and State 5 of Illinois, have invented a new and useful Machine for Ribbing the Teeth of Saws, of which the following is a specification.

My invention relates to a machine for raising ribs on the sides of the teeth of saws; and

the object of said invention is to provide a method of producing the particular shaped teeth described in my patent on saws, No. 542,630, dated July 16, 1895. I attain this object by the mechanism illustrated in the accompanying drawings, in which- Figure l is a front elevation of the entire machine. Fig. 2 is a section through so m, Fig. 1. Fig. 3 is a plan view of a portion of the machine, showing upper rolls and part of a circular saw on which the said ribs have been raised. Fig. 4 is a cross-section of a portion of the same.

Similar letters refer to similar parts throughout the several views.

The bed A, legs B, arm E, bracket 0, and bracketD, fastened to the legs, constitute the framework of the machine.

F is an overlapping cap of great strength, which is hinged to the bed A at 10, Fig. 2.

3o g is a shaft which is made to revolve in boxes on the bed A, and h is a shaft which is made to revolve in boxes on cap F. Two hardened-steel rolls G and H are secured to shafts g and h and are made the proper form to force out the required rib s on the side of a tooth when it is passed between them.

Gears 2' and j are secured to the shafts g and h and engage each other.

J is a heavy bolt which passes through the front side of bed A and cap F. On the top of this bolt is the adjusting-nut L, and on the bottom there is a cam K. With this device the cap F is drawn down and firmlyholds the roller H at the proper distance from roller G to produce the rib on the saw-tooth. The adjusting-nut L regulates the height of cap F from bed A for the purpose of giving the required distance between the rollers G and H for different thicknesses of saw-blades.

Spring 0 raises the front of cap F, and thereby raises roller II when released by cam K.

On the arm E there is a sliding block 1?, on

which there is a stud Q, on which a: circular saw S is pivoted. This is adjusted by the screw M to bring the saw-teeth at the proper place between the rolls G H to produce the required width of rib. The end adjustment of roll H to bring it in the, proper relation with roll G is accomplished with an adjusting-screw I, which is held firmly from mov- 6o ing by lock-cam n, which drops into notches in the head. Screw Iworks through a block m, which is held to the cap F by studs Z.

The ribs 8 are raised on every second tooth on one side, and the blade is then turned over, and every second tooth is ribbed on the reverse side. This causes the teeth to be ribbed on alternate sides, every second tooth being ribbed on one side and the remaining teeth being ribbed on the other side.

The machine may be driven by power, but is operated by the crank a, which communicates the necessary power to the roller-shaft g by means of the gears and pinions b, c, e, and f. The rib is produced on a tooth by passing it between the rollers G and H when the cam K is down. Then by raising the cam the roller H rises high enough to allow the next tooth to pass through without ribbing, after which the cam is pressed down to rib 8o thenext tooth.

To rib the teeth of a band or straight saw, the blade is moved in a straight line under the rollers and is guided by a gage. (Not shown in the drawings.)

The roll H may be raised or lowered by a screw through a stationary frame and act directly on the box which holds the roll-shaft, but the movable cap F, operated by a cam, is preferred.

I am not aware that a machine wasever before constructed to force out a rib on the side of the tooth of a saw by the use of rolls or curved surfaces running in unison at the proper distance apart and with the proper 5 form to produce this result; nor am I aware of any rolling or beading machine that has ever before been made for any purpose that would produce such a rib on the tooth of a saw. -I therefore do not confine my invention to the specific mechanism herein described. Segments of rolls of the proper form can be used to produce the same result, and other methods of propelling them or the rolls in unison or adjusting them in relation to each other may be used.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a machine for forcing out a rib on the side of a saw-tooth, the combination with a main frame, of shafts mounted thereon parallel or nearly so with each other, rolls of the required form attached to said shafts, mechanism to rotate them in unison with each other, mechanism to adjust them the required distance from each other, and a device to open and close the said rolls in relation to each other without altering the adjustment, as and for the purpose specified.

2. In a saw-tooth-ribbing machine, the combination with a main frame, of two pieces of metal mounted thereon on which there are curved surfaces of the form required for ribbin'g saw -teeth, mechanism to move said curved surfaces in unison with each other, mechanism to adjust said curved surfaces the proper distance from each other to act as desired upon a saw-tooth, and a device that will permit one tooth to be acted upon and another tooth to escape action while ribbing a saw, substantially as specified.

3. In a saw-tooth-ribbin g machine, the combination with a main frame, of a piece of 7 CHARLES H. DOUGLAS.

Witnesses:

CHARLES F. PEASE, MARTHA B. PEASE. 

